• rapida = fast (adjective)
• rapide = quickly (adverb)
• rapidi = to hurry (infinitive)
• rapido = speed (noun)
• rapidu! = Hurry up! (imperative)
• rapidega = (adjective) very fast/hurried
• rapidulo = (noun) someone in a hurry
• malrapide = (adverb) slowly (opposite of quickly)
• malrapideti = (verb) to slow down a little
• rapidigi = to hurry something up
• rapidiganto = one who is hurrying things up
• rapidigisto = one who hurries things up as a profession (= boss!)
• rapidigilo = a tool for hurrying things up (an engine for a bicycle; television for social change)
• malrapidigilo = a tool for slowing things down (brake of a car; illiteracy for social change)
• korrapidigilo = something that makes the heart beat faster (detective novel; love!)
• rapidulino = (noun) some lady in hurry
• rapideco = fastness
• rapidmotorbiciklo = noun, fast bike